This summer, Diageo plans for the first time to dig into its advertising archive and to bring back some of its old TV ads to market Guinness Draught Extra Cold, a chillier version of its signature dark-brown beer. Guinness ads over the years have attained a cult-like status, and advertising agency Abbott Mead Vickers BBDO, part of Omnicom Group, New York, thinks campy ad images could bolster sales through an appeal to consumer nostalgia.